“The brief transition between wakefulness and sleep we experience each night has been known by many names: the ‘borderland state’, the ‘half-dream state’, the ‘pre-dream condition’. Its technical name is the hypnagogic state and, along with dreaming, it is one of the most fascinating altered states of consciousness we can experience without the use of drugs.” http://www.forteantimes.com/articles/163_hypnagogia.shtml